"These initiatives would need to draw on interventions that rely less on individual responsibility and more on changes to the environment," the report said.

If the right measures were taken there could be long-term savings of £760m a year for the UK's National Health Service, it added.

The initiatives assessed in the report include portion control for some packaged food and the reformulation of fast and processed food.

'Crisis proportions'

It said these were more effective than taxes on high-fat and high-sugar products or public health campaigns. Weight management programmes and workplace fitness schemes were also considered.

The report concluded that "a strategy of sufficient scale is needed as obesity is now reaching crisis proportions".

The rising prevalence of obesity was driving the increase in heart and lung disease, diabetes and lifestyle-related cancers, it said.

Dr Alison Tedstone, chief nutritionist at Public Health England (PHE), said: "The report is a useful contribution to the obesity debate. PHE has consistently said that simple education messages alone are not enough to tackle obesity."

Dr Tedstone said obesity required action across national and local government, industry and society as a whole, and there was "no single silver bullet solution".

The report was produced by McKinsey Global Institute, the business and economics research arm of consultancy firm McKinsey & Company.